src/mainboard/google/butterfly/chromeos.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011-2012 The ChromiumOS Authors.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <console/console.h>
#include <string.h>
#include <bootmode.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>

#include <southbridge/intel/bd82x6x/pch.h>
#include <ec/quanta/ene_kb3940q/ec.h>
#include "ec.h"

#define WP_GPIO		6
#define DEVMODE_GPIO	54
#define FORCE_RECOVERY_MODE	0
#define FORCE_DEVELOPER_MODE	0


int get_pch_gpio(unsigned char gpio_num);

#ifndef __PRE_RAM__
#include <boot/coreboot_tables.h>

#define GPIO_COUNT	6

void fill_lb_gpios(struct lb_gpios *gpios)
{
	device_t dev = dev_find_slot(0, PCI_DEVFN(0x1f,0));
	u16 gpio_base = pci_read_config16(dev, GPIOBASE) & 0xfffe;

	int lidswitch=0;
	if (!gpio_base)
		return;

	gpios->size = sizeof(*gpios) + (GPIO_COUNT * sizeof(struct lb_gpio));
	gpios->count = GPIO_COUNT;

	/* Write Protect: GPIO active Low */
	gpios->gpios[0].port = WP_GPIO;
	gpios->gpios[0].polarity = ACTIVE_LOW;
	gpios->gpios[0].value = !get_write_protect_state();
	strncpy((char *)gpios->gpios[0].name,"write protect",
							GPIO_MAX_NAME_LENGTH);

	/* Recovery: virtual GPIO active high */
	gpios->gpios[1].port = -1;
	gpios->gpios[1].polarity = ACTIVE_HIGH;
	gpios->gpios[1].value = get_recovery_mode_switch();
	strncpy((char *)gpios->gpios[1].name,"recovery", GPIO_MAX_NAME_LENGTH);

	/* Developer: virtual GPIO active high */
	gpios->gpios[2].port = -1;
	gpios->gpios[2].polarity = ACTIVE_HIGH;
	gpios->gpios[2].value = get_developer_mode_switch();
	strncpy((char *)gpios->gpios[2].name,"developer",
							GPIO_MAX_NAME_LENGTH);

	/* lid switch value from EC */
	gpios->gpios[3].port = -1;
	gpios->gpios[3].polarity = ACTIVE_HIGH;
	gpios->gpios[3].value = get_lid_switch();
	strncpy((char *)gpios->gpios[3].name,"lid", GPIO_MAX_NAME_LENGTH);
	printk(BIOS_DEBUG,"LID SWITCH FROM EC: %x\n", lidswitch);

	/* Power Button - Hardcode Low as power button may still be pressed
	   when read here.*/
	gpios->gpios[4].port = -1;
	gpios->gpios[4].polarity = ACTIVE_HIGH;
	gpios->gpios[4].value = 0;
	strncpy((char *)gpios->gpios[4].name,"power", GPIO_MAX_NAME_LENGTH);

	/* Was VGA Option ROM loaded? */
	gpios->gpios[5].port = -1; /* Indicate that this is a pseudo GPIO */
	gpios->gpios[5].polarity = ACTIVE_HIGH;
	gpios->gpios[5].value = gfx_get_init_done();
	strncpy((char *)gpios->gpios[5].name,"oprom", GPIO_MAX_NAME_LENGTH);

}
#endif

int get_pch_gpio(unsigned char gpio_num)
{
	device_t dev;
	int retval = 0;

#ifdef __PRE_RAM__
	dev = PCI_DEV(0, 0x1f, 0);
#else
	dev = dev_find_slot(0, PCI_DEVFN(0x1f,0));
#endif
	u16 gpio_base = pci_read_config16(dev, GPIOBASE) & 0xfffe;

	if (!gpio_base)
		return(0);

	if (gpio_num >= 64){
		u32 gp_lvl3 = inl(gpio_base + GP_LVL3);
		retval = ((gp_lvl3 >> (gpio_num - 64)) & 1);
	} else if (gpio_num >= 32){
		u32 gp_lvl2 = inl(gpio_base + GP_LVL2);
		retval = ((gp_lvl2 >> (gpio_num - 32)) & 1);
	} else {
		u32 gp_lvl = inl(gpio_base + GP_LVL);
		retval = ((gp_lvl >> gpio_num) & 1);
	}

	return retval;
}

int get_write_protect_state(void)
{
	return !get_pch_gpio(WP_GPIO);
}

int get_lid_switch(void)
{
	return (ec_mem_read(EC_HW_GPI_STATUS) >> EC_GPI_LID_STAT_BIT) & 1;
}

int get_developer_mode_switch(void)
{
	int dev_mode = 0;

#if FORCE_DEVELOPER_MODE
	printk(BIOS_DEBUG,"FORCING DEVELOPER MODE.\n");
	return 1;
#endif

	/* Servo GPIO is active low, reverse it for intial state (request) */
	dev_mode = !get_pch_gpio(DEVMODE_GPIO);
	printk(BIOS_DEBUG,"DEVELOPER MODE FROM GPIO %d: %x\n",DEVMODE_GPIO,
								 dev_mode);

	return dev_mode;
}

int get_recovery_mode_switch(void)
{
	int ec_rec_mode = 0;

#if FORCE_RECOVERY_MODE
	printk(BIOS_DEBUG,"FORCING RECOVERY MODE.\n");
	return 1;
#endif


#ifndef __PRE_RAM__
	if (ec_mem_read(EC_CODE_STATE) == EC_COS_EC_RO) {
		ec_rec_mode = 1;
	}
	printk(BIOS_DEBUG,"RECOVERY MODE FROM EC: %x\n", ec_rec_mode);
#endif

	return ec_rec_mode;
}